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Coefficients for Cubic Bezier Splines

It just so happens that the knot gradients of a Bezier Spline can be expressed in terms of the adjacent control points:


Note: this approach is entirely synthetic!
Using the vector is reasonable, but what makes 3 a magic number? 

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See the "Links" link above to find out the sources of the proposed informations
Pascal Vuylsteker / eScience / Computer Science / ANU 		Last modified: 20/4/2004
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